TABLE 1.

Vancomycin MIC and hVISA frequency among 489 MRSA blood isolates collected over an 11-year span

CharacteristicNo. (%) of isolates recovered in the following study period:
1996-1997 (n = 61)2000-2001 (n = 55)2002-2003 (n = 187)2005-2006 (n = 186)Total (n = 489)
Vancomycin MIC (μg/ml)
    ≤111 (18.0)10 (18.2)26 (13.9)27 (14.5)74 (15.1)
    1.540 (65.6)38 (69.1)139 (74.3)138 (74.2)355 (72.6)
    29 (14.5)7 (12.7)18 (9.6)16 (8.6)50 (10.2)
    31 (1.6)04 (2.2)5 (2.7)10 (2.1)
hVISA phenotype8 (13.1)5 (9.1)37 (19.8)21 (11.3)71 (14.5)